function main() {
    // 获取页面树实例
    const pageTreeEle = this.$$("page_tree_5glwdh");
    // 获取树渲染实例
    const treeRenderEle = pageTreeEle.$$getRenderElement();
    const treePanelEle = treeRenderEle.$$getTreeElement();
    const id = treePanelEle.$$getRootNode()[0].id;
    // const firstNode = treePanelEle.$$getFirstNode();
    treePanelEle.$$clickNode({ key: id });
}
